The year in numbers: 2006

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(CNN) -- Some highlights in numerical news from the past 12 months.

$1.65 billion: The amount paid by Google for video-sharing site YouTube in October.

68 million: The number of hits an Ohio-based industrial products company called Universal Tube and Rollform Equipment got to its Web site during August -- forcing it to crash repeatedly. The site's address was www.Utube.com.

24 years and four months: The jail sentence imposed on former Enron chief executive Jeffrey Skilling after he was convicted of 19 charges of fraud, conspiracy, insider trading and lying to auditors in October.

12,011.73: The record level reached by Dow Jones index of major U.S. shares on October 19 -- the first time in its history it had closed above 12,000 points.

$6.5 billion: The amount wiped off the value of online gambling shares in October after the U.S. Congress passed legislation to ban Internet gaming there.

654,965: The death toll in Iraq following the U.S.-led invasion in March 2003, according to a research paper produced by the John Hopkins Bloomberg School of Public Health and published in the British medical journal, The Lancet.

9: The number of countries believed to possess nuclear weapons following North Korea's claim that it had detonated a nuclear device in October.

27: The number of EU countries from January 1, 2007, following Bulgarian and Romanian accession.

186: The number of people killed when seven bombs exploded on crowded commuter trains in Mumbai, India, in an attack blamed on Islamic militants. Hundreds more were injured.

10: The number of trans-Atlantic jets terrorists allegedly planned to blow up between the UK and the U.S. in a plot thwarted by British police in August.

2040: The date by which the Arctic will be ice-free all summer, according to research released in December.

2048: The date by which seafood stocks will run out at current rates of international fishing, according to Canadian research published in November.

300 million: The population mark reached by the U.S. in October, according to U.S. Census Bureau figures.

1 billion: The number of people who lack access to clean water -- around one-fifth of the world's population, according to U.N. data.

39.5 million: The number of people living with AIDS worldwide according to a U.N. report released in November.

$55.8 million: The amount grossed by "Pirates of the Caribbean: Dead Man's Chest" on its opening day, breaking all cinema records. Grossing more than $1 billion worldwide, the movie was the year's most popular with cinema-goers.

52 hours: The amount of time magician David Blaine spent shackled to a spinning gyroscope without food and water 40 feet above New York's Time Square in November.

7: Michael Schumacher's record number of Formula One world titles. The German retired this year with 91 career grands prix wins -- another best.

17: The size of Australian swimming star Ian Thorpe's feet. Five-times Olympic gold medallist Thorpe announced his retirement from the pool in November aged 24.

3: The number of Grand Slam titles won by tennis world No. 1 Roger Federer in 2006. The Swiss player amassed a record $8.34 million in prize money during the season.

18.5--9.5: The score in September's Europe-U.S. Ryder Cup, won by Europe for the third time in a row.

8: The number of planets in the Solar System following the International Astronomical Union's demotion of Pluto in August. Pluto -- officially a planet since was re-classified as a "dwarf planet."